Year	Percent
1972-01-01	65.20410000000000
1973-01-01	63.68380000000000
1974-01-01	65.47130000000000
1975-01-01	69.92840000000000
1976-01-01	72.02360000000000
1977-01-01	70.49430000000000
1978-01-01	67.04400000000000
1979-01-01	65.65060000000000
1980-01-01	66.40920000000000
1981-01-01	69.63060000000000
1982-01-01	71.69120000000000
1983-01-01	70.33650000000000
1984-01-01	65.90630000000000
1985-01-01	62.73210000000000
1986-01-01	60.67970000000000
1987-01-01	61.73820000000000
1988-01-01	66.18840000000000
1989-01-01	71.33900000000000
1990-01-01	73.13470000000000
1991-01-01	73.93700000000000
1992-01-01	74.82090000000000
1993-01-01	74.24700000000000
1994-01-01	70.77250000000000
1995-01-01	68.55970000000000
1996-01-01	68.94840000000000
1997-01-01	71.38100000000000
1998-01-01	76.98790000000000
1999-01-01	84.49340000000000
2000-01-01	90.13090000000000
2001-01-01	94.24820000000000
2002-01-01	94.11700000000000
2003-01-01	99.34050000000000
2004-01-01	107.38900000000000
2005-01-01	120.95100000000001
2006-01-01	140.68800000000000
2007-01-01	155.48300000000000
2008-01-01	167.25799999999998
2009-01-01	173.14700000000002
2010-01-01	170.23100000000000
2011-01-01	169.25200000000000
2012-01-01	163.74000000000000
2013-01-01	151.58400000000000
2014-01-01	136.55200000000002
2015-01-01	121.58100000000000
2016-01-01	111.57600000000001